ALTERTABLE emp rebuild partitionp1,p2; 优化分区: 如果从分区中删除了大量的行,或者对一个带有可变长度的行(也就是说,有VARCHAR,BLOB,或TEXT类型的列)作了许多修改,可以使用“ALTER TABLE ... OPTIMIZE PARTITION”来收回没有使用的空间,并整理分区数据文件的碎片。 ALTERTABLE empoptimize partition p1,p2; 分...
partition p04valuesless than (10,35), partition p05valuesless than (10, maxvalue), partition p06valuesless than (maxvalue, maxvalue), );insertintorc3(a, b)values(1,10);select(1,10)<(10,10)fromdual;--根据结果存放到p02分区上了selectpartition_name, partition_expression, partition_descripti...
PARTITION_NAME: p0 SUBPARTITION_NAME: NULL PARTITION_ORDINAL_POSITION: 1 SUBPARTITION_ORDINAL_POSITION: NULL PARTITION_METHOD: RANGE SUBPARTITION_METHOD: NULL PARTITION_EXPRESSION: id SUBPARTITION_EXPRESSION: NULL PARTITION_DESCRIPTION: 10 TABLE_ROWS: 2 AVG_ROW_LENGTH: 8192 DATA_LENGTH: 16384 MAX_DATA...
PARTITION_NAME: p1 SUBPARTITION_NAME: NULL PARTITION_ORDINAL_POSITION: 2 SUBPARTITION_ORDINAL_POSITION: NULL PARTITION_METHOD: RANGE SUBPARTITION_METHOD: NULL PARTITION_EXPRESSION: id SUBPARTITION_EXPRESSION: NULL PARTITION_DESCRIPTION: 20 TABLE_ROWS: 2 AVG_ROW_LENGTH: 8192 DATA_LENGTH: 16384 MAX_DATA...
partition p3VALUESLESS THAN (21) ); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 按照这种分区方案,在商店1到5工作的雇员相对应的所有行被保存在分区P0中,商店6到10的雇员保存在P1中,依次类推。注意,每个分区都是按顺序进行定义,从最低到最高。这是PARTITION BY RANGE 语...
SELECT PARTITION_NAME AS Name ,PARTITION_ORDINAL_POSITION AS Position ,PARTITION_METHOD AS Method ,PARTITION_EXPRESSION AS Expression ,PARTITION_DESCRIPTION AS Description ,TABLE_ROWS AS Rows ,CREATE_TIME AS CreateTime FROM INFORMATION_SCHEMA.PARTITIONS ...
partition p2 values less than (1990), partition p3 values less than maxvalue ); 以year(birthdate)表达式(计算员工的出生日期)作为范围分区依据。这里最值得注意的是表达式必须有返回值。 2) 创建list分区 create table emp (empnovarchar(20) not null , ...
ERROR1526(HY000): Table has no partitionforvalue50 我们发现他是报错的,因此我可以使用values less than maxvalue语句添加分区,maxvalue 代表的是最大的可能的整数值,当服务器不知道把数据放到哪个分区的时候,我们就把这个数据放到这个分区。 mysql>alter table empaddpartition(partition p3 values less than max...
However, the values of the PARTITION_NAME, SUBPARTITION_NAME, PARTITION_ORDINAL_POSITION, SUBPARTITION_ORDINAL_POSITION, PARTITION_METHOD, SUBPARTITION_METHOD, PARTITION_EXPRESSION, SUBPARTITION_EXPRESSION, and PARTITION_DESCRIPTION columns are all NULL. Also, the PARTITION_COMMENT column in this case is ...
简介:Mysql 表分区创建方法 查看表分区信息 SELECTpartition_name part,partition_expression expr,partition_description descr,table_rowsFROMinformation_schema.PARTITIONSWHEREtable_schema = SCHEMA ()AND table_name = '表名'; 创建range分区 —— 分区字段为整型 ...